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2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Pyrosulphuric \Pyr`o*sul*phu"ric\, a. [Pyro- + -sulphuric.] (Chem.) Pertaining to, or designating, an acid called also {disulphuric} acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, {H2S2O7} resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Disulphuric \Di`sul*phu"ric\, a. [Pref. di- + sulphuric.] (Chem.) Applied to an acid having in each molecule two atoms of sulphur in the higher state of oxidation. [1913 Webster] {Disulphuric acid}, a thick oily liquid, {H2S2O7}, called also {Nordhausen acid} (from Nordhausen in the Harts, where it was originally manufactured), {fuming sulphuric acid}, and especially {pyrosulphuric acid}. See under {Pyrosulphuric}. [1913 Webster]
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